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This is a huge aspect of the his game Holiday needs to work on.
His defensive ability is probably the biggest hole in his game, and needs that to change in order for him to become a complete player.
This season is where we've seen real damage done to Philadelphia by opposing point guards like Rajon Rondo, Derrick Rose, Deron Williams, Brandon Jennings, Jeff Teague and Tony Parker, all of whom have recorded at least 21 points against the Sixers in a game this season.
Rondo has clearly been a force hard to stop in this playoff series, and the reason is Holiday's defense.
Yet there are times in games where Holiday will play tight defense and it's very effective. He has shown he is capable of playing shutdown defense, it just isn't put forth all the time.